Cover image for Servicing TV/VCR combo units
Title:
Servicing TV/VCR combo units
Author:
Davidson, Homer L.
Personal Author:
Publication Information:
Indianapolis, IN : Prompt Publications, 2001.
Physical Description:
xii, 334 pages : illustrations ; 28 cm.
Summary:
This book offers straightforward troubleshooting advice, theory of component solutions, and model-specific repair advice for TV/VCR combination units.
Language:
English
ISBN:
9780790612249
Format :
Book

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Call Number
Material Type
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Status
Central Library TK6642 .D385 2001 Adult Non-Fiction Non-Fiction Area-Oversize
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Summary

Summary

Servicing TV/VCR Combo Units covers the servicing issues surrounding this popular electronic device. TV/VCR combo units have become smaller, more affordable, and functional. They are now used in new ways, including applications in autos, campers, kitchens, and other non-traditional locations. Homer Davidson uses his vast knowledge to cover this subject in a way no one else can.


Author Notes

Homer L. Davidson owned and operated his own radio and TV repair shop for 38 years.


Table of Contents

Introductionp. 1
Part I Troubleshooting the TV Circuitsp. 3
Chapter 1 Troubleshooting Low-Voltage Power Supply Circuitsp. 5
Required Test Equipmentp. 6
Chip Componentsp. 7
Removing Chip Partsp. 8
Removing the Chassisp. 10
Low-Voltage Circuitsp. 10
Degaussing Problemsp. 12
Rectifier Circuitsp. 13
Troubleshooting the Low-Voltage Power Supplyp. 14
Filter Capacitor Problemsp. 15
Repairing Filter Capacitor Problemsp. 15
Switching Power Supply Circuitsp. 16
Switching Transformer Circuitsp. 17
Troubleshooting the Switching Power Supplyp. 18
Low-Voltage Regulatorsp. 21
Line-Voltage Regulatorsp. 22
Relay Problemsp. 23
DC Power Adjustmentp. 25
DC Power Circuitsp. 25
Troubleshooting the DC Power Supplyp. 26
TV Shutdownp. 28
Start-up Problemsp. 30
Poor Raster Widthp. 31
Lightning Damage/Power Surgep. 32
Isolation Transformerp. 34
Chapter 2 Servicing the TV Tuner IF Circuitsp. 35
The Varactor Tunerp. 36
Tuner Problemsp. 38
SMD Tuner Componentsp. 40
Locating a Defective Tunerp. 40
Tuner Problemsp. 40
No Up or Down Actionp. 43
Defective IC in Tunerp. 45
Unusual Tuner Problemsp. 47
Outside the Tunerp. 47
Tuner or IFp. 48
IF Problemsp. 49
SAW Filter Circuitsp. 50
Chapter 3 Troubleshooting TV Horizontal Circuitsp. 53
Troubleshooting Horizontal Circuitsp. 53
Deflection ICp. 55
Horizontal Circuit Problemsp. 58
Deflection IC Problemsp. 59
Driver Transistor Problemsp. 60
Horizontal Driver-Transformer Problemsp. 61
Horizontal Output Transistor Problemsp. 62
Horizontal Foldoverp. 64
Defective Safety Capacitorsp. 66
Poor Widthp. 69
Intermittent or No Startup/Shutdownp. 70
Flyback Problemsp. 75
Storm Damage and Power Surgesp. 76
Chapter 4 Troubleshooting the TV Vertical Sectionp. 77
Vertical Problemsp. 77
Vertical Output ICp. 79
Signal Tracing Vertical Circuitsp. 79
Vertical Waveformsp. 80
Vertical IC Output Circuitsp. 81
No Vertical Sweepp. 83
Improper Vertical Sweepp. 87
Loss of Vertical Sweep at the Topp. 88
Intermittent Vertical Sweepp. 89
Vertical Foldoverp. 91
Poor Linearityp. 91
Vertical Yoke Problemsp. 92
Rolling Picturesp. 93
Vertical Crawling and Jittersp. 94
ESR Meter Capacitor Testsp. 94
Retrace Linesp. 95
Vertical Pincushion Problemsp. 96
Unusual Vertical Problemsp. 97
Chapter 5 Servicing High-Voltage and CRT Problemsp. 99
The Flybackp. 99
High-Voltage Problemsp. 102
Different Screen Sizesp. 104
Flyback Problemsp. 104
Arcing Flybackp. 105
Removing and Replacing the Flybackp. 107
Arcing Noisesp. 107
Scan-Derived Secondary Voltagesp. 109
CRT Heater Circuitsp. 110
High-Voltage Probep. 111
Signal Tracing High-Voltage Circuitsp. 111
CRT Circuitsp. 114
Symptoms of a Defective CRTp. 115
CRT Retrace Line Problemsp. 116
Color Amp Problemsp. 117
Defective CRTp. 117
Rejuvenating the Picture Tubep. 119
Chapter 6 Troubleshooting TV Video and Color Circuitsp. 121
Video Circuit Problemsp. 123
On-Screen Display Problemsp. 136
Troubleshooting the Video Circuitsp. 136
TV Chroma Circuitsp. 138
Color Circuit Problemsp. 139
Green Color Problemsp. 142
Blue Color Problemsp. 143
Chapter 7 Servicing Control Functions, AGC, Sync, and Audio Circuitsp. 145
AGC (Automatic Gain Control) and Sync Problemsp. 148
Sync Problemsp. 151
Troubleshooting Sync Circuitsp. 153
Audio Circuitsp. 153
Audio Output Circuitsp. 155
Intermittent Soundp. 158
Weak or Low Soundp. 159
Distorted Soundp. 160
Troubleshooting Sound Circuitsp. 162
Speaker Problemsp. 163
Part II Reparing VCR Circuits and Mechanical Movementsp. 165
Chapter 8 Servicing VCR Speed Problemsp. 167
Removing the VCR Chassisp. 168
The Different Speedsp. 170
Test Equipment and Hand Toolsp. 170
VCR Tape Pathp. 171
Cleaningp. 171
Cleaning the Audio Controlp. 173
Periodic Check and Lubricationp. 173
Belt Replacementp. 174
Poor Board Connectionsp. 175
Speed Problemsp. 176
Loading Motor Problemsp. 177
Capstan Operation Problemsp. 180
Dead Unit with No Cylinder/Drum Rotationp. 181
Fast Forward and Rewind Problemsp. 182
Rewind Mode Operation Problemsp. 184
Take-Up Reel Problemsp. 185
Wow (low-end) and Flutter (high-end)p. 188
Chapter 9 Solving Loading and Unloading Problemsp. 189
Tape Problems: Jams, Eats, Ejects at Shut Downp. 202
Mode Motor and Switch Problemsp. 206
Cassette-In Switch Problemsp. 207
Chapter 10 Dead VCR Power Circuitsp. 209
Electrolytic Problemsp. 210
Power Surge and Lightning Damagep. 210
Dead Chassisp. 210
Dead with No Power Upp. 211
Dead with Fuse Problemsp. 212
Dead with Display Problemsp. 215
Intermittent or Erratic No Function Symptomp. 219
Bad Tape-End Sensor and Sensor Lampsp. 219
Power Supply Voltagep. 220
Problems with Power Upp. 221
Shuts Down - Shuts Offp. 226
Voltage Regulator Problemsp. 229
Chapter 11 Servicing VCR Shutdown and Noise Problemsp. 231
Chapter 12 Troubleshooting VCR Motor Circuitsp. 251
The Loading Motorp. 252
Loading Motor Circuitsp. 252
Troubleshooting Loading Motor Circuitsp. 255
The Capstan Motorp. 257
Capstan Drive Circuitsp. 258
Cylinder or Drum Motorp. 266
Drum and Cylinder Circuitsp. 267
Drum Motor Problemsp. 269
Chapter 13 Repairing VCR Playback, Recording, Color, and Video Circuitsp. 271
The Various Tape Headsp. 271
Video Record and Playbackp. 274
Audio Record and Playbackp. 274
Video Playback Symptomsp. 275
Audio Playback Problemsp. 277
Color Problemsp. 279
Take-up Reel Problemsp. 282
Dew Light Problemsp. 284
Chapter 14 Servicing VCR Fast-Forward and Rewind Problemsp. 287
Fast-Forward and Rewind Problemsp. 287
Take-up Reel Problemsp. 298
Chapter 15 Servicing VCR Audio Problemsp. 301
The TV-Audio Record Circuitsp. 301
The Audio Playback Circuitsp. 303
The Bias Oscillator Circuitsp. 304
The Erase Headsp. 306
Troubleshooting Audio Playback and Recording Circuitsp. 307
Audio Power Output Circuitsp. 308
Headphone Circuitsp. 309
Troubleshooting the Power Output Audio Circuitsp. 311
Distorted Audiop. 317
Switching Transistor Problemsp. 320
Mechanical Drawingsp. 321
Glossary of Abbreviated Termsp. 332

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